KR101452734B1 - Drawing press controlling blank holding force with MR damper - Google Patents
Drawing press controlling blank holding force with MR damper Download PDFInfo
- Publication number
- KR101452734B1 KR101452734B1 KR1020140063610A KR20140063610A KR101452734B1 KR 101452734 B1 KR101452734 B1 KR 101452734B1 KR 1020140063610 A KR1020140063610 A KR 1020140063610A KR 20140063610 A KR20140063610 A KR 20140063610A KR 101452734 B1 KR101452734 B1 KR 101452734B1
- Authority
- KR
- South Korea
- Prior art keywords
- mold
- panel
- product
- damper
- coil
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
- B21D24/08—Pneumatically or hydraulically loaded blank holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
- B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing press for controlling a blank holding force using an EM damper. More specifically, the MR damper is applied to the blank holder of the drawing press to adjust the magnitude of the current applied to the coil, thereby changing the intensity of the magnetic field induced in the coil, thereby adjusting the viscosity of the MR fluid to vary the spring force (BHF) can be adjusted without additional equipment in the mold, even if the molding conditions change, such as changing the material of the material panel, changing the cushion pressure of the drawing press, changing the shape of the product, By applying the MR damper instead of the hydraulic cylinder method which requires the piping work or the hydraulic piping and the hydraulic supply system, Drawing that controls the blank holding force using a damper Lt; / RTI >
To this end, the present invention relates to a first type, mounted on a bolster, having a space corresponding to the shape of a lower surface of a product to be processed, and supporting a panel to be processed into a product; A second mold mounted on the slide and having a protrusion corresponding to the shape of the top surface of the product to be machined, the mold being arranged to face the first mold; And a blank holder mounted on the slide, the blank holder being spaced apart from the second die so as to press the panel contacting the upper surface of the first mold, wherein the blank holding force is controlled using an emblem damper.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing press for controlling a blank holding force using an EM damper. More specifically, the MR damper is applied to the blank holder of the drawing press to adjust the magnitude of the magnetic field applied to the coil by adjusting the magnitude of the current applied to the coil, thereby adjusting the viscosity of the MR fluid to vary the spring force (BHF) can be adjusted without additional equipment in the mold, even if the molding conditions change, such as changing the material of the material panel, changing the cushion pressure of the drawing press, changing the shape of the product, By applying the MR damper instead of the hydraulic cylinder method which requires the piping work or the hydraulic piping and the hydraulic supply system, Drawing that controls the blank holding force using a damper Lt; / RTI >
Deep Drawing is a method of reducing the diameter of a material or narrowing the periphery of a sheet to a center and processing it into a crucible. A drawing press is used for deep drawing processing.
The force for fixing the space between the die and the blank holder in the drawing press is called a blank holding force (BHF). BHF is one of the important factors to be controlled in sheet metal processing.
For example, when BHF is insufficient, wrinkles occur in the sheet metal, and when the BHF is excessive, the sheet metal may be torn.
Gas-spring type and hydraulic cylinder type are generally used to control BHF.
1 is a conceptual diagram of a general gas spring method.
In FIG. 1, the left side corresponds to a gas spring without an accumulator, and the right side corresponds to a gas spring with an accumulator.
In the gas spring type, gas injected into the cylinder serves as a working medium.
The gas spring method has the advantages of relatively low cost, easy installation, and insertion into various presses. However, the gas spring method has a problem in that it exhibits a forward force behavior of the force with respect to the stroke. In the deep drawing, reverse BHF is often required. However, according to the gas spring method, there is a problem that it can not be coped with in such a case.
The hydraulic cylinder method has the advantage of high control accuracy, but it has a high cost and a very complicated structure.
Prior Art Document: KR Registration Practical Utility Model No. 0383794 (published on May 5, 2005)
It is an object of the present invention to provide a drawing press capable of overcoming the problems of a gas spring type and a hydraulic cylinder type and varying the spring force of the blank holder in a simple process and at a low cost, There is a purpose.
To achieve the above object, a drawing press for controlling a blank holding force using an emblem according to the present invention is mounted on a bolster and has a space corresponding to a shape of a lower surface of a product to be processed A first mold supporting a panel to be processed into a product; A second mold mounted on the slide and having a protrusion corresponding to the shape of the top surface of the product to be machined, the mold being arranged to face the first mold; And a blank holder mounted on the slide, the blank being spaced apart from the second mold to press the panel contacting the upper surface of the first mold.
The blank holder includes a cylinder accommodating an MR fluid (Magneto-Rheological Fluid) therein, an outer piston inserted into the cylinder, an inner piston provided inside the outer piston, a coil provided between the outer piston and the inner piston, And a piston rod whose end is engaged with the outer piston and the inner piston.
Further, the present invention may further include a current regulator which is electrically connected to the coil to induce a magnetic field in the coil by applying a current to the coil, and adjusts the intensity of the magnetic field through the intensity of the current.
According to the present invention, by applying the MR damper to the blank holder of the drawing press to adjust the magnitude of the current applied to the coil, the intensity of the magnetic field induced in the coil can be changed, thereby adjusting the viscosity of the MR fluid, There is an effect.
Further, according to the present invention, it is possible to adjust the blank holding force (BHF) without additional devices in the mold even if the molding conditions such as the material change of the material panel, the cushion pressure change of the drawing press, There is a possible effect.
Further, according to the present invention, by applying the MR damper instead of the gas cylinder method in which the gas piping operation is required, or the hydraulic cylinder method in which the hydraulic piping and the hydraulic pressure supply device must be installed, the blank holding force of the drawing press can be adjusted by power supply alone, And low cost can be realized.
1 is a conceptual view of a general gas spring system,
FIG. 2 is a conceptual diagram of a drawing press for controlling a blank holding force using an MMP damper according to a preferred embodiment of the present invention,
FIG. 3 is a partially cutaway perspective view showing the internal structure of the blank holder in FIG. 2,
Fig. 4 is an enlarged perspective view of the coil portion in Fig. 3;
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.
FIG. 2 is a conceptual diagram of a drawing press for controlling a blank holding force using an emblem according to a preferred embodiment of the present invention, FIG. 3 is a partially cutaway perspective view showing the internal structure of the blank holder of FIG. 2, 3 is an enlarged perspective view of the coil portion.
A drawing press for controlling a blank holding force (BHF) using an MR damper according to a preferred embodiment of the present invention includes a bolster 10, a
The bolster 10 supports the entire drawing press including the
The
The
The
The current regulating
The
The
The
For this purpose, the
3 and 4, the
The
The MR fluid (I04) changes its viscosity when an external magnetic field is applied, and its viscosity increases in proportion to the intensity of the applied magnetic field. Since the intensity of the magnetic field is proportional to the magnitude of the current, the spring force of the
In addition, by varying the spring force of the
The
The
The
3) of the
The
By doing so, the present invention can adjust the blank holding force (BHF) without additional devices in the mold even if the molding conditions are changed, such as changing the material of the material panel, changing the cushion pressure of the drawing press, .
Further, since the MR damper is applied instead of the gas cylinder method in which the gas piping operation is required, or the hydraulic cylinder method in which the hydraulic piping and the hydraulic supply device are to be installed, the blank holding force of the drawing press can be adjusted by power supply alone, Low cost can be realized.
It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.
10 - Bolster 12 - Type 1
20 - Slide 22 - Type 2
30 - Current regulator 100 - Blank holder
102 - Cylinder 104 - MR fluid
106 - outer piston 108 - inner piston
110 - coil 112 - piston rod
Claims (3)
The blank holder adjusts the pressure output applied in the circumferential direction of the panel and the tensile force in the longitudinal direction of the first type sidewall so that the panel is formed into a product without wrinkles and breaks. The MR fluid exhibits isotropy when the magnetic field is non- The particles exhibit anisotropy in the magnetic field direction upon application and the viscosity increases in proportion to the intensity of the magnetic field so that the spring force of the blank holder is changed by the viscosity change and the pressure output applied in the circumferential direction of the panel due to the variation of the spring force A drawing press that controls the blank holding force using an MMP damper that adjusts the tensile force in the longitudinal direction on the 1-inch side wall so that the panel is formed into a product without wrinkles and breakage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020140063610A KR101452734B1 (en) | 2014-05-27 | 2014-05-27 | Drawing press controlling blank holding force with MR damper |
Applications Claiming Priority (1)
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KR1020140063610A KR101452734B1 (en) | 2014-05-27 | 2014-05-27 | Drawing press controlling blank holding force with MR damper |
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KR101452734B1 true KR101452734B1 (en) | 2014-10-22 |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105081107A (en) * | 2015-09-23 | 2015-11-25 | 燕山大学 | Drawing forming die with blank pressing conducted by adopting electronic control permanent magnet technique and blank pressing method of drawing forming die |
CN106216512A (en) * | 2016-07-29 | 2016-12-14 | 燕山大学 | The cupping tool of a kind of pressure variable edge force with memory character and control method thereof |
CN107081379A (en) * | 2017-06-11 | 2017-08-22 | 武汉轻工大学 | A kind of cupping tool |
US20170246672A1 (en) * | 2016-02-25 | 2017-08-31 | Dajun Zhou | Metal stamping tool with a hybrid magnetorheological-nitrogen spring |
KR101801129B1 (en) | 2016-12-19 | 2017-11-24 | 인하대학교 산학협력단 | Mr hydraulic circuit using permanent magnet and hydraulic lifter having the same |
CN109175055A (en) * | 2018-07-13 | 2019-01-11 | 燕山大学 | Mixing flange fixing installation is carried out using electric control permanent magnet technology and permanent magnet technology |
DE102017214660A1 (en) * | 2017-08-22 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Pressure pin of a press and press with pressure pin |
KR20210062180A (en) | 2019-11-21 | 2021-05-31 | 덕성금속공업(주) | Aluminum alloy drawers using variable and differential control |
CN116921603A (en) * | 2023-06-28 | 2023-10-24 | 珠海聚能精密工业有限公司 | Cold heading shaping device for precision machining with controllable thickness |
Citations (1)
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JP2010115696A (en) * | 2008-11-14 | 2010-05-27 | Ihi Corp | Die cushion device for press |
-
2014
- 2014-05-27 KR KR1020140063610A patent/KR101452734B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010115696A (en) * | 2008-11-14 | 2010-05-27 | Ihi Corp | Die cushion device for press |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105081107B (en) * | 2015-09-23 | 2017-04-26 | 燕山大学 | Drawing forming method with blank pressing conducted by adopting electronic control permanent magnet technique |
CN105081107A (en) * | 2015-09-23 | 2015-11-25 | 燕山大学 | Drawing forming die with blank pressing conducted by adopting electronic control permanent magnet technique and blank pressing method of drawing forming die |
US20170246672A1 (en) * | 2016-02-25 | 2017-08-31 | Dajun Zhou | Metal stamping tool with a hybrid magnetorheological-nitrogen spring |
US10408296B2 (en) * | 2016-02-25 | 2019-09-10 | Fca Us Llc | Metal stamping tool with a hybrid magnetorheological-nitrogen spring |
CN106216512B (en) * | 2016-07-29 | 2018-06-08 | 燕山大学 | A kind of control method of the cupping tool of the pressure variable edge force with memory character |
CN106216512A (en) * | 2016-07-29 | 2016-12-14 | 燕山大学 | The cupping tool of a kind of pressure variable edge force with memory character and control method thereof |
KR101801129B1 (en) | 2016-12-19 | 2017-11-24 | 인하대학교 산학협력단 | Mr hydraulic circuit using permanent magnet and hydraulic lifter having the same |
CN107081379A (en) * | 2017-06-11 | 2017-08-22 | 武汉轻工大学 | A kind of cupping tool |
DE102017214660A1 (en) * | 2017-08-22 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Pressure pin of a press and press with pressure pin |
US11479005B2 (en) | 2017-08-22 | 2022-10-25 | Bayerische Motoren Werke Aktiengesellschaft | Pressure pin of a press and press having pressure pin |
DE102017214660B4 (en) | 2017-08-22 | 2022-12-15 | Bayerische Motoren Werke Aktiengesellschaft | Pressure bolt of a press and press with pressure bolt |
CN109175055A (en) * | 2018-07-13 | 2019-01-11 | 燕山大学 | Mixing flange fixing installation is carried out using electric control permanent magnet technology and permanent magnet technology |
KR20210062180A (en) | 2019-11-21 | 2021-05-31 | 덕성금속공업(주) | Aluminum alloy drawers using variable and differential control |
CN116921603A (en) * | 2023-06-28 | 2023-10-24 | 珠海聚能精密工业有限公司 | Cold heading shaping device for precision machining with controllable thickness |
CN116921603B (en) * | 2023-06-28 | 2024-04-05 | 珠海聚能精密工业有限公司 | Cold heading shaping device for precision machining with controllable thickness |
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